73563281
Oct 15, 1985
Apr 14, 1987
MACHINES AND MACHINE LINES USED FOR RECOVERING COAL MINING REFUSE AND REMOVING IRON FROM BLAST FURNACE [ CYLINDERS ] * CINDERS *
MachineryMINERAL MANUFACTURED [ FORM ] * FROM * WASHED REFUSE AND USED AS AN ADDITIVE IN CONCRETE
Nonmetallic Building Materials